document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=913981>Question 913981</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve this problem:\r<BR>\n" );
document.write( "\n" );
document.write( "The radiator in a car is filled with a solution of 70 per cent antifreeze and 30 per cent water. The manufacturer of the antifreeze suggests that for summer driving, optimal cooling of the engine is obtained with only 50 per cent antifreeze. If the capacity of the raditor is 3.6 liters, how much coolant (in liters) must be drained and replaced with pure water to reduce the antifreeze concentration to 50 per cent?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #554823 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=554823\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+ ALIGN=MIDDLE  ALT=\"+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = liters of coolant to be drained<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.7x+ ALIGN=MIDDLE  ALT=\"+.7x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = liters of antifreeze in <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+ ALIGN=MIDDLE  ALT=\"+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.7%2A3.6+=+2.52+ ALIGN=MIDDLE  ALT=\"+.7%2A3.6+=+2.52+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = liters of antifreeze <BR>\n" );
document.write( "originally in radiator<BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "Note that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+ ALIGN=MIDDLE  ALT=\"+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters drained off are<BR>\n" );
document.write( "replaced with <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+ ALIGN=MIDDLE  ALT=\"+x+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters of water, so<BR>\n" );
document.write( "radiator ends up with <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3.6+ ALIGN=MIDDLE  ALT=\"+3.6+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters<BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+2.52+-+.7x+%29+%2F+3.6+=+.5+ ALIGN=MIDDLE  ALT=\"+%28+2.52+-+.7x+%29+%2F+3.6+=+.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2.52+-+.7x+=+.5%2A3.6+ ALIGN=MIDDLE  ALT=\"+2.52+-+.7x+=+.5%2A3.6+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2.52+-+.7x+=+1.8+ ALIGN=MIDDLE  ALT=\"+2.52+-+.7x+=+1.8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.7x+=+2.52+-+1.8+ ALIGN=MIDDLE  ALT=\"+.7x+=+2.52+-+1.8+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.7x+=+.72+ ALIGN=MIDDLE  ALT=\"+.7x+=+.72+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x+=+1.029+ ALIGN=MIDDLE  ALT=\"+x+=+1.029+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "1.029 liters of coolant must be drained<BR>\n" );
document.write( "off and replaces with water<BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.7%2A1.029+=+.72+ ALIGN=MIDDLE  ALT=\"+.7%2A1.029+=+.72+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters of coolant drained off<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.3%2A1.029+=+.3087+ ALIGN=MIDDLE  ALT=\"+.3%2A1.029+=+.3087+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters of water drained off<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.3%2A3.6+=+1.08+liters+of+water+to+start+with%0D%0A%7B%7B%7B+1.08+-+.3087+=+.7713+ ALIGN=MIDDLE  ALT=\"+.3%2A3.6+=+1.08+liters+of+water+to+start+with%0D%0A%7B%7B%7B+1.08+-+.3087+=+.7713+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters of water remaining<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+.7713+%2B+1.029+=+1.8+ ALIGN=MIDDLE  ALT=\"+.7713+%2B+1.029+=+1.8+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters of water after <BR>\n" );
document.write( "re-filling with pure water<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3.6+-+1.8+=+1.8+ ALIGN=MIDDLE  ALT=\"+3.6+-+1.8+=+1.8+\"   DISABLED_style= \"max-width:90%; height:auto;\" > liters of antifreeze left<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1.8%2F3.6+=+.5+ ALIGN=MIDDLE  ALT=\"+1.8%2F3.6+=+.5+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );